[R] Scatter plot - using colour to group points?

[SarahH]

Thanks all for suggestions. 

I now have a nice plot showing the temperature of 6 different sites, each
site distinguished by different coloured points, using nested ifelse. My
apologies I thought I could change the type to "l" and the same arguments
would be applied to line graph, with 6 different lines for each site...? 
I wanted to try lines as I think they might show the trends more clearly.  
I have just found the plottrix package manual and will try that to achieve
this, and look at ggplot too.


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